EP0364811B1 - Composite coil forms for electrical systems - Google Patents
Composite coil forms for electrical systems Download PDFInfo
- Publication number
- EP0364811B1 EP0364811B1 EP89118315A EP89118315A EP0364811B1 EP 0364811 B1 EP0364811 B1 EP 0364811B1 EP 89118315 A EP89118315 A EP 89118315A EP 89118315 A EP89118315 A EP 89118315A EP 0364811 B1 EP0364811 B1 EP 0364811B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- aramid
- coil
- electrical systems
- coil forms
- composite coil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
- H01F5/02—Coils wound on non-magnetic supports, e.g. formers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/902—High modulus filament or fiber
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/92—Fire or heat protection feature
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/131—Glass, ceramic, or sintered, fused, fired, or calcined metal oxide or metal carbide containing [e.g., porcelain, brick, cement, etc.]
- Y10T428/1314—Contains fabric, fiber particle, or filament made of glass, ceramic, or sintered, fused, fired, or calcined metal oxide, or metal carbide or other inorganic compound [e.g., fiber glass, mineral fiber, sand, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
- Y10T428/1362—Textile, fabric, cloth, or pile containing [e.g., web, net, woven, knitted, mesh, nonwoven, matted, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
- Y10T428/1362—Textile, fabric, cloth, or pile containing [e.g., web, net, woven, knitted, mesh, nonwoven, matted, etc.]
- Y10T428/1366—Textile, fabric, cloth, or pile is sandwiched between two distinct layers of material unlike the textile, fabric, cloth, or pile layer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
- Y10T428/1369—Fiber or fibers wound around each other or into a self-sustaining shape [e.g., yarn, braid, fibers shaped around a core, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2913—Rod, strand, filament or fiber
- Y10T428/298—Physical dimension
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31511—Of epoxy ether
- Y10T428/31525—Next to glass or quartz
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31721—Of polyimide
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31725—Of polyamide
- Y10T428/31728—Next to second layer of polyamide
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
- Y10T442/2475—Coating or impregnation is electrical insulation-providing, -improving, or -increasing, or conductivity-reducing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
- Y10T442/2631—Coating or impregnation provides heat or fire protection
Definitions
- This invention relates to electrical device coil forms and, more particularly, it relates to a coil form produced from fiber reinforced resin material.
- Coil forms fashioned from Nomex® aramid paper, a high temperature resistant paper with excellent physical and electrical properties are known for use in high temperature (greater than 200°C rating of UL Standard 1446) wherein a coil of wire is wound over the Nomex® paper coil form placed on a mandrel to support the form.
- this product does not exhibit a high degree of structural strength and the wire coil must be wound fairly loosely over the Nomex® paper coil form or the Nomex® will implode after the wire windings are in place and the winding mandrel is removed.
- the use of this coil form system is labor intensive, requires more wire than necessary and provides lower transformer efficiency.
- Insulation systems approved to UL Standard 1446 are rated by subjecting them to cycles of thermal aging, low temperature shock, humidity and vibration. At the end of each cycle the systems are checked at 600 volts for short circuits, with the cycle being repeated until the insulation breaks down. Test voltages may be higher for systems with higher operating voltages.
- the temperature rating assigned to an insulation system will depend on the service life of the equipment at different aging temperatures.
- a coil form which has high structural stability at a UL Standard 1446 rating of greater than 200°C and comprises a structure of fiber reinforced resin matrix material having longitudinal passage therethrough. The outer peripheral surface of the structure forming a support for a wire coil wound thereon.
- Suitable materials which may be used as the resin matrix include electrically insulating thermoplastic or thermoset resins such as polyethylene terephthalate, 6,6-nylon or electrical grade epoxy.
- the resin of choice is reinforced with aramid fibers which may be continuous, long fiber discontinuous such as chopped or randomly broken, but in any event greater than 0.00635 m (1/4") in length.
- the fiber volumes preferably are in the range of from about 15 to about 70% and more preferably in the range of from 20 to 50%.
- the coil forms can be made by any known process for making such forms as by braiding and filament winding of resin coated materials or by pultrusion methods or indeed by hand lay-up techniques well known in the art.
- Another preferred embodiment is an aramid prepreg based on an electrically insulating resin.
- the drawing illustrates a perspective view of a coil form of the invention having wire wound on its surface in the form of a coil.
- the drawing represents a specific coil form of the invention for purposes of illustration and includes an elongated thin-walled structure 10 defining a passage 10 a therethrough.
- the wall thickness is designated 10 b .
- the outer peripheral surface 10 c of the structure 10 forms a support for a wire coil 12 wound thereon.
- a polyimide release film is placed in the steel mold having a 0.000508 m (20 mil) shim plate.
- this release film 4.5 gm of pre-dried flame retarded polyethylene terephthalate polymer pellets are spread which are then alternately covered by 6-plies of style S-120 fiber glass woven fabric weighing 39 gm.
- the pellet-fabric sandwich structure is built successively until all of the 27 gm of the polymer has been used.
- a polyimide release film is placed on the top layer and mold is closed.
- the molding is carried out according to the following time-temperature cycle:
- the mold was inserted into the press at 310°C and held for 25 min (platens touching) under contact pressure, then held at 15 min at 345 kPa (50 psi), then held at 15 min at 1724 kPa (250 psi) and cooled under pressure.
- a sample of the panel was tested in accordance with UL Standard for Safety 1446, analyzed at Underwriters Laboratories, Inc. and received a Provisional Recognition as a Class R (220°C) motor or transformer insulation.
- Example 1 the fiber-glass fabric/thermoplastic polymer is replaced with a prepreg consisting of 4-plies of B-staged epoxy impregnated aramid paper.
- the paper was made from 85/15 Kevlar®/Nomex® aramid fibers (about 0.00635 m 1/4") long) on a standard wet-lay papermaking machine. The following molding cycle is used:
- a sample of the panel was tested in accordance with UL Standard for Safety 1446, analyzed at Underwriters Laboratories, Inc. and received a Provisional Recognition as a Class R (220°) motor or transformer insulation.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Organic Insulating Materials (AREA)
- Reinforced Plastic Materials (AREA)
- Paper (AREA)
- Insulating Of Coils (AREA)
- Laminated Bodies (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/251,773 US4944975A (en) | 1988-10-03 | 1988-10-03 | Composite coil forms for electrical systems |
US251773 | 1988-10-03 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0364811A2 EP0364811A2 (en) | 1990-04-25 |
EP0364811A3 EP0364811A3 (en) | 1991-12-04 |
EP0364811B1 true EP0364811B1 (en) | 1996-02-28 |
Family
ID=22953351
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89118315A Expired - Lifetime EP0364811B1 (en) | 1988-10-03 | 1989-10-03 | Composite coil forms for electrical systems |
Country Status (9)
Country | Link |
---|---|
US (1) | US4944975A (pt) |
EP (1) | EP0364811B1 (pt) |
JP (1) | JPH02144901A (pt) |
KR (1) | KR0143787B1 (pt) |
AU (1) | AU612309B2 (pt) |
BR (1) | BR8905013A (pt) |
CA (1) | CA2000085A1 (pt) |
DE (1) | DE68925777T2 (pt) |
IL (1) | IL91867A (pt) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3916137A1 (de) * | 1989-05-18 | 1990-11-22 | Basf Ag | Dichtungselemente und gleitlager aus faserverstaerkten kunststoffen |
US5036580A (en) * | 1990-03-14 | 1991-08-06 | E. I. Du Pont De Nemours And Company | Process for manufacturing a polymeric encapsulated transformer |
FR2681722B1 (fr) * | 1991-09-23 | 1994-04-08 | Electricite De France | Transformateur immerge non explosif haute/basse tension en regime de surcharge permanente. |
US5967394A (en) | 1994-11-04 | 1999-10-19 | Roll Systems, Inc. | Method and apparatus for pinless feeding of web to a utilization device |
US5534839A (en) * | 1995-04-05 | 1996-07-09 | Cramer Coil & Transformer Co., Inc. | Miniature transformer |
US6445269B1 (en) * | 1996-09-04 | 2002-09-03 | E.I. Du Pont De Nemours And Company | Dry-type high-voltage winding |
US6980076B1 (en) | 2000-05-19 | 2005-12-27 | Mcgraw Edison Company | Electrical apparatus with synthetic fiber and binder reinforced cellulose insulation paper |
JP2002051521A (ja) * | 2000-07-28 | 2002-02-15 | Twinbird Corp | 電磁往復駆動機構 |
WO2004087394A2 (en) * | 2003-03-31 | 2004-10-14 | Greene, Tweed Of Delaware, Inc. | Thermoplastic/fiber material composites, composite/metallic articles and methods for making composite/metallic articles |
AU2003232732A1 (en) * | 2003-05-06 | 2004-11-26 | Friwo Mobile Power Gmbh | Transformer |
US8456266B2 (en) * | 2009-06-22 | 2013-06-04 | Engineered Products Of Virginia, Llc | Transformer coil assembly |
CN102456475A (zh) * | 2010-10-19 | 2012-05-16 | 通用电气公司 | 磁性元件 |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4076869A (en) * | 1970-10-23 | 1978-02-28 | Ciba-Geigy Corporation | Hardenable epoxy resin compositions and process for making the same |
US3833182A (en) * | 1971-12-17 | 1974-09-03 | Gen Electric | Integral open mesh spool |
JPS56123A (en) * | 1979-06-15 | 1981-01-06 | Hitachi Chem Co Ltd | Manufacture of vehicle wheel |
CH640664A5 (de) * | 1979-11-05 | 1984-01-13 | Sprecher & Schuh Ag | Mechanisch beanspruchbares glasfaserverstaerktes kunststoff-isolierteil. |
EP0037500B1 (de) * | 1980-03-21 | 1985-09-04 | W. Meffert KG | Spulengestell für luftgekühlte elektrische Wicklungen |
US4532275A (en) * | 1981-02-03 | 1985-07-30 | Teijin Limited | Fiber-reinforced composite materials |
US4421806A (en) * | 1981-08-13 | 1983-12-20 | Lockheed Missiles & Space Company, Inc. | Low density resin systems for improved filament-wound composites useful as rocket motor cases |
US4492779A (en) * | 1981-12-07 | 1985-01-08 | Thiokol Corporation | Aramid polymer and powder filler reinforced elastomeric composition for use as a rocket motor insulation |
US4595616A (en) * | 1982-02-18 | 1986-06-17 | General Electric Company | Encapsulated inductive devices with polybutadiene encapsulant |
US4421888A (en) * | 1982-03-30 | 1983-12-20 | Celanese Corporation | Sustained high arc resistant polyester composition |
US4504532A (en) * | 1983-02-03 | 1985-03-12 | Hercules Incorporated | Phenolic blast tube insulators for rocket motors |
US4608300A (en) * | 1983-06-21 | 1986-08-26 | Ciba-Geigy Corporation | Fibre composite materials impregnated with a curable epoxide resin matrix |
GB8400290D0 (en) * | 1984-01-06 | 1984-02-08 | Wiggins Teape Group Ltd | Fibre reinforced plastics structures |
US4595620A (en) * | 1984-07-23 | 1986-06-17 | The Dow Chemical Company | Dead-folded articles from fiber-reinforced plastics |
US4579773A (en) * | 1984-08-20 | 1986-04-01 | Standard Oil Company (Indiana) | Laminates |
US4663225A (en) * | 1986-05-02 | 1987-05-05 | Allied Corporation | Fiber reinforced composites and method for their manufacture |
US4814222A (en) * | 1986-05-14 | 1989-03-21 | Burlington Industries, Inc. | Aramid fibers with improved flame resistance |
US4701735A (en) * | 1986-12-11 | 1987-10-20 | Standex Electronics (U.K.) Limited | Bobbins for electrical coils and method of manufacturing electrical coils therefrom |
US4826724A (en) * | 1988-06-10 | 1989-05-02 | Manville Corporation | Moldable fibrous mat |
-
1988
- 1988-10-03 US US07/251,773 patent/US4944975A/en not_active Expired - Fee Related
-
1989
- 1989-10-03 CA CA002000085A patent/CA2000085A1/en not_active Abandoned
- 1989-10-03 JP JP1258640A patent/JPH02144901A/ja active Pending
- 1989-10-03 EP EP89118315A patent/EP0364811B1/en not_active Expired - Lifetime
- 1989-10-03 DE DE68925777T patent/DE68925777T2/de not_active Expired - Fee Related
- 1989-10-03 BR BR898905013A patent/BR8905013A/pt not_active IP Right Cessation
- 1989-10-03 IL IL9186789A patent/IL91867A/en not_active IP Right Cessation
- 1989-10-03 AU AU42450/89A patent/AU612309B2/en not_active Ceased
- 1989-10-04 KR KR1019890014266A patent/KR0143787B1/ko not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
AU612309B2 (en) | 1991-07-04 |
DE68925777T2 (de) | 1996-08-14 |
IL91867A (en) | 1994-01-25 |
BR8905013A (pt) | 1990-05-08 |
IL91867A0 (en) | 1990-06-10 |
US4944975A (en) | 1990-07-31 |
AU4245089A (en) | 1990-04-05 |
KR900007007A (ko) | 1990-05-09 |
KR0143787B1 (ko) | 1998-08-17 |
JPH02144901A (ja) | 1990-06-04 |
EP0364811A2 (en) | 1990-04-25 |
DE68925777D1 (de) | 1996-04-04 |
CA2000085A1 (en) | 1990-04-03 |
EP0364811A3 (en) | 1991-12-04 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0364811B1 (en) | Composite coil forms for electrical systems | |
US4716072A (en) | Multilayer composite structure for smooth surfaces | |
EP0133205B1 (en) | Cored yarn as a reinforcement structure | |
US4552805A (en) | Composites reinforced with high strength aramid fibers having fibrillated ends | |
KR100610321B1 (ko) | 운모 함유 절연 테이프의 제조방법 | |
EP0375851A2 (en) | Encapsulated electrical or electronic device | |
US3323962A (en) | Reinforced resinous tubular laminates | |
US3183142A (en) | Reinforced resinous structural material | |
CN218826425U (zh) | 绝缘结构、电机和电子装置 | |
US5691058A (en) | Sheet material for electrical insulation, prepreg and electrically insulated coil using the same | |
RU2001111395A (ru) | Система высоковольтной изоляции | |
US3019286A (en) | Insulated electrical conductors and process for producing same | |
US3839133A (en) | Transformer insulating end ring | |
EP0403688A1 (en) | Improved thermal conductive material | |
JPH0344899B2 (pt) | ||
JPH09272155A (ja) | 積層板およびその製造方法 | |
RU2084030C1 (ru) | Электроизоляционный препрег | |
JP2959789B2 (ja) | 油入電器用絶縁物 | |
JPH10177913A (ja) | 超電導コイル | |
Giese | Flexible laminates for electrical insulation and conduction. I. Conventional composites | |
RU2079987C1 (ru) | Способ изготовления подложки для печатных плат | |
JPH0679722A (ja) | ガラス布、樹脂含浸基材及び配線基板 | |
CN1071025A (zh) | 超小型高压电流(电压)互感器 | |
Emery et al. | Application of flat glass backed mica paper tape to VPI’ed high voltage stator coils | |
JPH02184235A (ja) | 回転電機のコイルエンド部の支え絶縁 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): BE CH DE ES FR GB IT LI NL SE |
|
17P | Request for examination filed |
Effective date: 19901227 |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): BE CH DE ES FR GB IT LI NL SE |
|
17Q | First examination report despatched |
Effective date: 19940920 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): BE CH DE ES FR GB IT LI NL SE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY Effective date: 19960228 Ref country code: BE Effective date: 19960228 Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT Effective date: 19960228 Ref country code: CH Effective date: 19960228 Ref country code: LI Effective date: 19960228 |
|
REF | Corresponds to: |
Ref document number: 68925777 Country of ref document: DE Date of ref document: 19960404 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19960531 |
|
ET | Fr: translation filed | ||
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 19970825 Year of fee payment: 9 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 19970903 Year of fee payment: 9 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19970904 Year of fee payment: 9 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19970908 Year of fee payment: 9 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19981003 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19990501 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 19981003 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19990630 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 19990501 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19990803 |